WM8281ECSSLASHR datasheet(192/392 Pages) CIRRUS

192 / 392 page

WM8281

192

Rev 4.0

OUTPUT SIGNAL PATH DIGITAL VOLUME LIMIT

A digital limit control is provided on each of the output signal paths. Any signal which exceeds the

applicable limit will be clipped at that level. The limit control is implemented in the digital domain,

before the output path DACs.

For typical applications, a limit of 0dBFS is recommended for the analogue output paths (OUT1,

OUT2, OUT3 and OUT4).

The digital speaker outputs (OUT5 and OUT6) can handle signal levels up to +3dBFS; a maximum

setting of +3dBFS is recommended for these output paths.

Caution is advised when selecting other limits, as the output signal may clip in the digital and/or

analogue stages of the respective signal path(s)

The digital limit register fields are described in Table 66 and Table 67.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R1042

(0412h

DAC

Volume

Limit 1L

7:0

OUT1L_VOL_LIM

[7:0]

81h

Output Path 1 (Left) Digital Limit

-6dBFS to +6dBFS in 0.5dB steps

00h to 73h = Reserved

74h = -6.0dBFS

75h = -5.5dBFS

… (0.5dB steps)

80h = 0.0dBFS

… (0.5dB steps)

8Bh = +5.5dBFS

8Ch = +6.0dBFS

8Dh to FFh = Reserved

(see Table 67 for limit range)

R1046

(0416h

DAC

Volume

Limit 1R

7:0

OUT1R_VOL_LI

M [7:0]

81h

Output Path 1 (Right) Digital Limit

-6dBFS to +6dBFS in 0.5dB steps

00h to 73h = Reserved

74h = -6.0dBFS

75h = -5.5dBFS

… (0.5dB steps)

80h = 0.0dBFS

… (0.5dB steps)

8Bh = +5.5dBFS

8Ch = +6.0dBFS

8Dh to FFh = Reserved

(see Table 67 for limit range)

R1050

(041Ah

DAC

Volume

Limit 2L

7:0

OUT2L_VOL_LIM

[7:0]

81h

Output Path 2 (Left) Digital Limit

-6dBFS to +6dBFS in 0.5dB steps

00h to 73h = Reserved

74h = -6.0dBFS

75h = -5.5dBFS

… (0.5dB steps)

80h = 0.0dBFS

… (0.5dB steps)

8Bh = +5.5dBFS

8Ch = +6.0dBFS

8Dh to FFh = Reserved

(see Table 67 for limit range)

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